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Wiktionary
fursuit

n. (context slang English) An animal outfit used in the furry subculture. vb. (context intransitive English) To wear a fursuit.

Wikipedia
Fursuit

Fursuits are animal costumes. Fursuits can be worn for personal enjoyment, work or charity.

The term "fursuit" is believed to have been coined in 1993 by Robert King and is usually used to describe custom-made animal costumes owned and worn by cosplayers or members of the furry fandom. Unlike mascot suits, which are usually affiliated with a team or organization, fursuits represent a stand-alone character.

Fursuiters may adopt another personality while in costume for the purpose of performance. Fursuits are typically sold online by commission or auction, but can also be sold at conventions.